"Problematic" is just vague. It's not that much more writing to specify the actual problems.

It's a rhetorical device that dates back to the ancient Greeks (meiosis). It's absolutely a lot more writing to enumerate the ways in which Elon Musk is problematic.

In a sane world it would read that way. Unfortunately, we live in a world where such nondescript descriptors (“problematic”, “objectionable”, “unprofessional”, “toxic”, “extremist”, “far-$SIDE”, a few others depending on usage) have been used, and overused, to accuse or smear people without taking on much of a burden of proof or making any statements specific enough to be falsifiable.

They now provoke instinctive revulsion when used in culture-war-adjacent contexts even when, as here, their usage is entirely legitimate (you presuppose a vague but mutually understood allegation rather than nebulously introducing a fresh one). I think only “controversial” has escaped this fate, but it might be too weak for your purposes.

(To be clear, I am only trying to explain why your phrasing might cause your interlocutor to momentarily recoil even when—as in my case—they don’t actually have any problem with the contents of your statement. What you do with this explanation is up to you: I don’t believe these terms are short-term salvageable at this point, but neither will I begrudge others their choice of hopeless cause; I certainly have my own fair share of those.)